A Look at minit
Sys-V init has long been the standard solution for booting. It's kind of easy to work with, it kind of works and everybody kind of knows it. However, being open minded, let's look at an alternative approach.
There are quite a few alternatives. All of them focus on improving boot times. This is accomplished by starting and running different processes simultaneously and asynchronously. Doing type of boot attempts to use all (more) parts of the hardware simultaneously and avoid having to wait for slow hardware.
In an embedded setting, one more factor to look for is keeping the footprint and number of processes down (each process comes with an overhead - albeit small).
One of the alternatives that I've looked at is minit by Felix von Leitner of diet-libc fame. What can it do? Well, the most basic feature is that it can start services and takes dependencies into account, e.g. it waits for the network to be up before it starts the web server. It also does respawning and handles ctrl+alt+delete.
Being the brain child of von Leitner, it is also minimalist (to the extreme?) and works with diet-libc. So, how does it work?
The configuration lives in /etc/minit, where each sub-directory contains one or services. Each service is configured from a number of symlinks and text files, all listed in detail in this howto. Basically, you create a symlink called "run" pointing at the program to start, a text file called "depends" with the names of any prerequisite services, an empty file called "respawn" if the service is to be respawned upon termination, and so on.
Having configured all your services, create a directory called "default" and add a depends file there listing your services. That will kickstart the system.
Johan Thelin is a consultant working with Qt, embedded and free
software. On-line, he is known as e8johan.
|Open-Source Space||Jul 31, 2014|
|Silicon Mechanics Gives Back||Jul 30, 2014|
|Reglue: Opening Up the World to Deserving Kids, One Linux Computer at a Time||Jul 29, 2014|
|diff -u: What's New in Kernel Development||Jul 23, 2014|
|Great Scott! It's Version 13!||Jul 21, 2014|
|Adminer—Better Than Awesome!||Jul 17, 2014|
- Silicon Mechanics Gives Back
- Reglue: Opening Up the World to Deserving Kids, One Linux Computer at a Time
- Numerical Python
- NSA: Linux Journal is an "extremist forum" and its readers get flagged for extra surveillance
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Tech Tip: Really Simple HTTP Server with Python
- diff -u: What's New in Kernel Development
- Linux Systems Administrator
- Senior Perl Developer
- Technical Support Rep